212022709 has 2 divisors, whose sum is σ = 212022710. Its totient is φ = 212022708.

The previous prime is 212022667. The next prime is 212022787. The reversal of 212022709 is 907220212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210888484 + 1134225 = 14522^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 212022709 - 2⁷ = 212022581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212002709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106011354 + 106011355.

It is an arithmetic number, because the mean of its divisors is an integer number (106011355).

Almost surely, 2^212022709 is an apocalyptic number.

It is an amenable number.

212022709 is a deficient number, since it is larger than the sum of its proper divisors (1).

212022709 is an equidigital number, since it uses as much as digits as its factorization.

212022709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 212022709 is about 14560.9995879404. Note that the first 3 decimals coincide. The cubic root of 212022709 is about 596.2944855299.

The spelling of 212022709 in words is "two hundred twelve million, twenty-two thousand, seven hundred nine".